Ceiling of Gamma(n+1/5)/Gamma(1/5).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =8a(6) =37a(7) =229a(8) =1648a(9) =13508a(10) =124269a(11) =1267543a(12) =14196478a(13) =173197025a(14) =2286200719a(15) =32464050200a(16) =493453563030